<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>菜单导航</title>
    <style>
        input:focus {
            background-color: skyblue;
            border: 2px solid red;
            outline: 2px solid blue;
            transition: 0.2s;
        }
    </style>
</head>
<body>
    <input type="text">
</body>
</html>